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<html>
<head>
	<meta charset="UTF-8">
	<title>响应式练习</title>
	<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
	<link rel="stylesheet" href="css/index.css">
</head>
<body>
	<div class="container">
		<div class="col">左侧</div>
		<div class="col">中间</div>
		<div class="col">右侧</div>
	</div>
</body>
</html>